Changes in Accumulated other comprehensive income (loss) ("AOCI") by component (Tables)

3 Months Ended

Mar. 31, 2023

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Changes in accumulated other comprehensive income (loss) by component

	For the three months ended March 31
(in millions of Canadian dollars)	Foreign currency net of hedging activities(1)		Derivatives(1)		Pension and post- retirement defined benefit plans(1)		Equity accounted investments(1)		Total(1)
Opening balance, January 1, 2023	$	1,505	$	—	$	(1,410)	$	(4)	$	91
Other comprehensive (loss) income before reclassifications	(27)		—		—		3		(24)
Amounts reclassified from accumulated other comprehensive income	—		1		6		—		7
Net other comprehensive (loss) income	(27)		1		6		3		(17)
Closing balance, March 31, 2023	$	1,478	$	1	$	(1,404)	$	(1)	$	74
Opening balance, January 1, 2022	$	(182)	$	(4)	$	(1,915)	$	(2)	$	(2,103)
Other comprehensive (loss) income before reclassifications	(349)		—		—		46		(303)
Amounts reclassified from accumulated other comprehensive loss	—		1		31		1		33
Net other comprehensive (loss) income	(349)		1		31		47		(270)
Closing balance, March 31, 2022	$	(531)	$	(3)	$	(1,884)	$	45	$	(2,373)

(1)Amounts are presented net of tax.